Proble using Garageband

I hope this is the right place to psot this!
I'm looking for anyone spend a lot of time using Garageband? Cos I'm having problems with it. It's not the programme it's how to use it. I've done all the exercises, but for some reason when i create the first half of a song with loops, I can't seem to get any further, mainly because, as in all songs, the music after the first verse needs to change key or whatever to make a chorus and I can't do this properly! I don't see how to change the loops correctly.

When you first make a song you can choose the key that its made in. After that, when you find loops, you can add them, then go look at the notation. Raise or lower depending on what you want. tell us if that was what you meant.

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